Improvement in bridges



ttnitei tatr @met @Mira Letters Patent No.v 110,173, dated December 13, 1870; antedatetl Decelvnber 3, 187.0.

IMPROVEMENT IN BRIDGES.

The Schedule referred to in these Letters Patent and making paxt of the same.

To all whom 'it may concern:

. thereon making a part ot' this specilication.

The nature ot' my invention consists in the construction and arrangement of a bridge, as will be hereinafter fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and usethe same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in whieh- Figure 1 is a perspective view, and

Figure 2 is a longitudinal vertical section of my bridge.

A A represent upright posts, which are set in the ground from six to ten feet, and from twelve to forty feet from the banks of the creek, and then the grade covers all'up.

[nto the upper ends of the posts A A are let in beams B B, supported by braces C C, and a crossbeain, D, laid across the outer ends of the beams B B, the whole forming the abutment at each ,end of the bridge.

By placing the abutments at a distance of from twelve to forty feet from the banks of the creek, the v The arch `E of the bridge is formed of lumber from six to inches wide and two inches thick, set edgewise, and beveled on one edge to form tle circle, spiked Well together by suitable spikes.

The end pieces are further spiked to the cross-.bars D D. This arch is a portion of the bridge, and not for the bridge to rest on, as is now usually done.

A rod, G, with bolts at the ends, passes through the center of the end pieces ot' the arch, and also throngl'i-the center of the cross-beams D D, keeping theV end of' the bridge from bulging up4 when the weight is on one end thereof.

The ends of the cross-beams D D are connected by siderods l-I H, .which help to keep the bridge together.

The bridge thus constructed will be all covered up Except a portion in the center of the arch, and thus rendering it secure that it cannot be carried off with high Water.

Having thus fully described myiuvention,

IVh-at I claim as new, and desire to secure by Letters Patent, is-

The cou'lbination ot' the abutments A B G D, arch E, central rod G, and sidenods H H, all constructed and arranged as described, substantially as and for the purposes herein set forth.

In' testimony that I claim the foregoing, I have hereunto set my hand this 12th day of April, 1870,

` MARSHALL TURLY.

Vitnesses:

V. H'. GREGG, S. J. HAMM. 

